ort8850 Lattice Semiconductor Corp., ort8850 Datasheet - Page 76

• Manufacturer Part Number: ort8850
• Description: Field-programmable System Chip Fpsc Eight-channel X 850 Mbits/s Backplane Transceiver
• Manufacturer: Lattice Semiconductor Corp.

Lattice Semiconductor
Termination Resistor
The LVDS drivers and receivers operate on a 100 Ω differential impedance, as shown below. External resistors are
not required. The differential driver and receiver buffers include termination resistors inside the device package, as
shown in Figure 36 below.
Figure 36. LVDS Driver and Receiver and Associated Internal Components
LVDS Driver Buffer Capabilities
Under worst-case operating condition, the LVDS driver must withstand a disabled or unpowered receiver for an
unlimited period of time without being damaged. Similarly, when its outputs are short-circuited to each other or to
ground, the LVDS driver will not suffer permanent damage Figure 37 illustrates the terms associated with LVDS
driver and receiver pairs.
Figure 37. LVDS Driver and Receiver
Figure 38. LVDS Driver
LVDS DRIVER
DRIVER
V
V
OA
OB
100
A
B
V
V
OA
OB
INTERCONNECT
A
B
DEVICE PINS
EXTERNAL
V
R
GPD
LOAD
C
B
CENTER TAP
76
C
A
V
V
OD
AA
BB
= (V
50
50
OA
V
V
IA
IB
– V
RECEIVER
OB
ORCA ORT8850 Data Sheet
)
LVDS RECEIVER